The Eflite Celectra comes with a transformer barely capable of charging four batteries simultaneously at the factory settings. The factory settings also tend to charge the batteries a bit fast for my liking. I prefer then charged at 1C.

Instructions below on how to slow down your charge rate to about 1C to extend the life of your batteries. This mod Voids the warranty. Proceed at your own risk. Use a voltage meter to verify your work.